naked festival; semi-naked festival
A traditional Japanese festival where participants wear minimal clothing, typically a loincloth (fundoshi). Often held in winter or at shrines to pray for good harvests, health, or to ward off evil.
Every February, a famous naked festival is held in Okayama.
裸祭りでは、男たちがふんどし姿で神輿を担ぐ。
At the naked festival, men carry the portable shrine wearing only loincloths.